Answer: 9 7/12 hours
Step-by-step explanation: To solve this problem we will simply add 4 1/3 to 5 1/4. first we will need to make the denominators the same. The denominator that will work for both numbers is 12.
So, multiply the denominator and numerator in 4 1/3 by 4 to get 4 4/12 and multiply the denominator and numerator in 5 1/4 by 3 to get 5 3/12.
Now simply add the two hours together.
4 4/12 + 5 3/12 = 9 7/12
So Nita spend 9 7/12 hours studying.